Patent GB-580118-A (GB)
Title: Improvements in or relating to web renewing mechanisms for printing or other machines
IPC: B65H19/18
Filed: 1945-04-16
Abstract: 580,118. Feeding webs. WOOD NEWSPAPER MACHINERY CORPORATION. April 16, 1945, No. 9455. Convention date, June 14, 1944. [Class 100 (i)] In a web-renewing mechanism for a printing or other machine having a web tensioning device applied to the roll surface, a control actuator is provided on the new roll adjacent its leading end, adapted, as it moves away from the surface of the new roll, to actuate means to increase the tension on the new roll. As shown, the new rolls 21, 23, and the old roll 22 are carried by a spider 26 on a spindle 24 to which is attached a disc 88 carrying a rod 89 threadedly engaging a projection on a disc 86, so that turning the rod 89 causes a small relative adjustment of the discs 86, 88. An arm 47 carrying a brush 55 and a knife 62 is mounted on a shaft 49 carrying a worm wheel 50 adapted to be driven from a motor 54 and which may be clamped to the rim 47 by a hand wheel 52. Electrically conductive strips 102, 103, forming control actuators are attached, either by means of a tab or directly, to the leading edge of the web on the new roll 21. To make a splice, belts 37, driven from the press, are placed in contact with the roll 21 to accelerate it to web speed, and a switch 110 is closed. The strip 102 then, by bridging two side by side brushes 104 closes a circuit containing a relay 108, thereby closing contacts 113, to close a circuit, actuating a solenoid 60 to release the brush 55 which by a spring 59 moves the running web 36 into contact with the new roll 21 to effect the join. The strip 103 then by bridging a pair of brushes 106, closes a circuit to a relay 111 to close contacts 119 in a circuit to actuate a solenoid 67 to release the knife 62 to sever the old web 36, and also to close contacts 120 in a circuit which actuates a solenoid 71 whose armature 72 carries contacts 73, 74 to close circuits to start the motors 68, 54 and has a latch 79 to engage a spring-urged latch 80 pivoted on the stand 25 carrying the spider 26. Operation of the motor 54 causes the arm 47 to move to the right to the inoperative position and operation of the motor 68 rotates a worm 69 which engages the disc 86, thereby causing the spider 26 to turn in a clockwise direction, carrying the roll 21 into the tensioning belts 27, until one of three equally-spaced pins 84 on the disc 86 engages a pin 82 on the latch 80 to release the armature 72 and stop the motors 54, 68. When the running web is nearly exhausted, the operator closes a switch 130 by-passing the contacts 73 and starting the motor 68 to turn the spider into the position shown ; the hand wheel 52 is loosened to allow the arm 47 to come to the vertical position, and tightened again and the armatures of the solenoids 60, 67 are reset so that a new splicing operation can be carried out as described above. In a modification the method of splicing employed is that described in Specification 555,707, using self-sticking rubber cement; the belts 37, strip 102, brushes 104, and brush 55 being omitted. Specification 572,659 also is referred to.